We feel this is because the person doing rosin has become more of a connissoure and wants to enjoy the flavor and effects. The person with BHO may be new and not fully aware of a low temp dab. Learn more about low temp dabs here.
For the ultimate flavor, many connoisseurs will use a vape like the SSV. This can be controlled for your perfect temp. The Silver Surfer vapes flower and with the EOK attachment, you can do traditional dabs.